Hi Bob,


I will try disassembling it to see where the stain is attached to.
I disassembled it once many years ago and if I remember it correctly,
there is a loose filter on top of the panel. Perhaps the damage is in it.


Best regards,

Isaac


Em 21/10/2012 11:59, Bob Blick escreveu:
> Hi Isaac,
>
> I had to take my THS720 apart once and it wasn't too hard. I don't
> remember how accessible or repairable the LCD was, but you might explore
> it a little. The LCD likely has its filters and backlight diffuser
> attached with tape. Maybe you could use the filter from a portable DVD
> player.
>
> At the time I fixed mine (it had a dirty connector inside that just
> needed cleaning), I asked Tektronix about parts. I seem to recall they
> had a flat rate, over a thousand dollars.
>
> Best regards,
>
> Bob
>
>
>
> On Sun, Oct 21, 2012, at 07:15 AM, Isaac Marino Bavaresco wrote:
>> Dear All,
>>
>>
>> My Tektronix THS730A's LCD screen got damaged. It has an irregularly
>> shaped region near the center of the screen that is faint.
>> If I adjust the contrast then I can see the image in that region, but
>> then the undamaged area gets too dark to be seen.
>> It is clearly something related to the polarizing filters because I can
>> see the stain even with the scope turned off. Besides, the stain contour
>> does not follow the pixel's borders (it is continuous, not serrated).
>>
>> Would it be possible to replace just the polarizing filters? If not,
>> where can I find a replacement LCD panel?
>> This model is long out of production, I think Tektronix doesn't stock
>> its parts anymore. Here in Brazil there is no more official Tektronix
>> representatives anyway, and the guys that have the part in stock charge
>> almost US$1,000.00.
>>
>> I tried to buy a THS720A in e-Bay to use just the LCD panel but was
>> outbid.
>> I appreciate any suggestions.

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